Trample.When Aurochs Herd enters the battlefield, you may search your library for an Aurochs card, reveal it, and put it into your hand. If you do, shuffle your library.Whenever Aurochs Herd attacks, it gets +1/+0 until end of turn for each other attacking Aurochs.

Cumulative upkeep {S}i} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it. {S}i} can be paid with one mana from a snow permanent.).If a creature would ...